Finding the Third Proportional to 31,378,557 and 67,968,856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,378,557 : 67,968,856.50 = 67,968,856.50 : x
2. Step 2: Convert to fraction form
   31,378,557/67,968,856.50 = 67,968,856.50/x
3. Step 3: Cross multiply
   31,378,557x = 67,968,856.50 × 67,968,856.50
4. Step 4: Simplify right side
   31,378,557x = 4,619,765,453,917,592
5. Step 5: Solve for x
   x = 4,619,765,453,917,592/31,378,557
6. Step 6: Final answer
   x = 147,226,829.26